Montreal police say a man, believed to be between 50 and 65 years old, "entered an establishment" and stole a painting by renowned Quebec artist Marc-Aurèle Fortin titled Maison en hiver.

Montreal police are seeking help from the public as they attempt to identify thieves who quietly made off with four works of art between May and October, including one that was on display at Lachine city hall.

The works of art are estimated to be worth $50,000.

According to a release issued by Montreal police on Friday, the first case involved a man, believed to be between 50 and 65 years old, who “entered an establishment” and stole a painting by renowned Quebec artist Marc-Aurèle Fortin titled Maison en hiver.

The second heist occurred on Sept. 29 at Lachine city hall, where a bust of French explorer René-Robert Cavelier de LaSalle was stolen from the entrance to the public building. In that case, investigators believe two men were involved, including a man whose age is also estimated to be between 50 and 65 years old. The other man is believed to be much younger — somewhere between 25 and 30 years old. The two men left the scene of the crime in a dark GMC Terrain.

In the third theft, someone entered an art gallery on Sherbrooke St. W., close to St. Marc St., and made off with a painting by Alfred Pellan. In that case as well, the suspect was described as being between 50 and 65 years old.

In the fourth case, someone entered an art gallery on Crescent St., near Sherbrooke St. W., and made off with a metal sculpture by Jacques Huet. The suspect in that heist is estimated to be about 50 years old.

“It is possible that the suspect aged between 50 and 65 years old is the same individual in the (first) three events which were captured on camera,” Montreal police said in a statement.

Anyone with information on the stolen artwork is asked to either call 911 or to contact Montreal police through its Info-Crime line at 514-393-1133.